Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-13
Astrophys.J.662:1245-1253,2007
Astronomy and Astrophysics
Astrophysics
19 pages, 7 figures, accepted ApJ 1/12/07
Scientific paper
10.1086/516561
We present 10 - 19 um moderate resolution spectra of ten M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. The IRS allows us to examine molecular spectroscopic features/lines at moderate spectral resolution in a heretofore untapped wavelength regime. These R~600 spectra allow for a more detailed examination of clouds, non-equilibrium chemistry, as well as the molecular features of H2O, NH3, and other trace molecular species that are the hallmarks of these objects. A cloud-free model best fits our mid-infrared spectrum of the T1 dwarf epsilon Indi Ba, and we find that the NH3 feature in epsilon Indi Bb is best explained by a non-equilibrium abundance due to vertical transport in its atmosphere. We examined a set of objects (mostly M dwarfs) in multiple systems to look for evidence of emission features, which might indicate an atmospheric temperature inversion, as well as trace molecular species; however, we found no evidence of either.
Cushing Michael. C.
Kirkpatrick Joseph D.
Leggett Sandy K.
Mainzer Amanda K.
Marley Mark S.
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